"The only way I would consider a turbo setup with regular headers is to mount the turbo under the car where the fuel tank is and run a fuel cell." Doesn't placing the turbo that far from the carb create serious turbo lag?
Not if the turbo is sized right. Trunk mount generally uses a small turbine due to the lower exhaust energy (heat) but still a large compressor to support decent power. There is a point where the ratio gets too extreme, but that's the case for any turbo setup.
Not really, there are also advantages of intercooling as the charged air has to travel a long ways towards the carb.... Every foot of charge pipe the temp decreases a substantial amount. Usually the blow off valve is located close to the turbocharger so when we let off the gas the boosted air does not back up at the throttle blades. I still prefer the simple twin turbon system myself, however there are many ways to skin a cat.
Are these header flanges readily available? I'm considering a twin setup as well but want to retain AC so the standard kit wouldn't work for me. However I suppose I could take the "logs" in the kit and build an extension from them, moving the turbo further up front (?) There are several videos on YouTube with cars that have rear setups and several kits for Camaros, mustangs, vettes and others. Even saw one vid of a mustang drag car with two huge turbos in the hatch. I'm no expert but I would think in a drag car it wouldn't be much of an issue since you build boost before launch anyway. Street car might be another story. I would think the return side would provide a heck of an intercooling effect as well. Less direct air, but far more surface area. ---------- Post added at 06:04 PM ---------- Previous post was at 06:03 PM ---------- Your post made it before mine typing on an iPad isn't the fastest thing...
Yes, just PM Mark to buy some header flanges he does sell them... From what we can tell there is no real lag on the street even with the turbo mounted 10 feet behind the engine... I have some info from a guy with a 3900 pound 70 Chevelle who runs twin turbos on his mild 1st gen 350 Chevy engine and he gets from the starting line at the quarter line to 18 PSI in 1.6 seconds running 10.55 so if anything I would give the nod to the twin turbo setup at the track. That is leaving at 2000 RPM with a 2400 Stall converter and no trans brake. It is hard to say without a comparison of two perfectly sized and tuned systems one remote single and two turbos close to the engine.
This is exactly what I want to do to offer a single kit. The y-pipe that has been referred to as a kit is really not, nor was it intended to be. Originally I thought it would make a good kit, but the piping is too tough to fit and cars vary enough that fitment issues would be a pain. I tried to make a super affordable option, but it just didn't work. My plan is to take the driver's side manifold, add a T4 flange, and make the wastegate bigger, perhaps 50mm. Then, add a provision to the bottom of the manifold forward of the motor mount for a crossover pipe. The passenger's side will be the regular log, with only an outlet for the crossover. The crossover could be 2", so it should fit fairly well. A flex section under the fan shroud/water pump area would allow for engine variance. A GT45 turbo would support 600-700hp. This method would not require the oil pan to be removed. The kit would cost around the same as the twins, but maybe could still be a little less. Anyone want to be the first?
Would the turbo be in the same location as the twin setup? I plan on running A/C, which I think has to go on the passenger side so alternator and whatever else on the driver. I like the idea of going in front of the engine for the cross over. Seems to be the least intrusive, but is 2" adequate for a 500-600hp level? I realize it is a short length compared to a full exhaust but I wouldn't want to choke it. As a comparison I'm thinking of my current daily driver which has dual 3" exhaust behind a 500hp NA sbc. There is a nice lq4/9 powered buick on here with a turbo and did just what you are referring, but he went to the passenger side for his if I recall. The only other thing I could think of would the exit side and room with the steering shaft and such. I don't have the car with me at the moment so it is hard to visualize how much room is really there. If I was to do a single, the GT45 is what I was originally looking at. It is the same one as the rear mounted setup on the other forum. I'm looking for a 500hp-600hp range in a daily driver. I'm sure a single can do it just fine, the twins just have that wow factor If I didn't live in Oklahoma with the brutal humidity in the summer I'd ditch the AC and not give it any more thought, but I'm too old to be that macho anymore... I want to but I'm a few months from being ready. However I could throw this puppy on the stock engine with the requisite fuel system upgrades and drive it till I blow up the tranny or rear end then go full tilt on it :idea2: You know, cause surely I won't break the engine first
The driver's side will be in the same place, maybe a bit more forward to make room for the larger compressor. A 2" crossover is plenty big for those power levels, probably more. Remember, the turbo needs that heat and velocity to make boost, so the pipes can be smaller than they would be to make the same power NA. Especially before the turbo. After the turbo is a different story, but a full mandrel bent 3" downpipe will snake around the steering column and frame. It is VERY tight, but it can be done. As soon as it is under the car you could dual it out for a traditional look, or step up to a larger single to help dissipate that energy post turbo. Backpressure after the turbo costs power, but there is only so much that can be made to fit. 500-600hp would be no problem though. The AC and alternator have both always gone on the passenger's side in stock applications I've seen. The power steering goes on the driver's side, but clears the kit. That might have to change for the crossover though, not sure. You would be surprised at what the stock engine will take. Mine still holds 8psi on pump gas after 6 years. I figured it would die by now but the turbo is pretty forgiving as long as you don't ping it on boost.
Sounds good to me. I don't have a mandrel bender, but I certainly don't mind taking some prebent pipes, cutting them up and welding as needed. My first welding experience was doing just that on my truck Going up to say a 4" single would be border line cool / "kid with a coffee-can-exhaust on a honda" Awesome. I'm not familiar with the accessory layouts with small blocks in these cars very much. My dad's el camino has a SB, but I haven't paid attention to it. His BBC chevelle was different as I recall, but its been a while. I've read a lot of the build ups on here. From the too-quiet red car (forget the owner's name), to the 455 with a turbo in a camaro to the wagon in Stillwater that doubled the HP on the 100k mile engine. I've seen your vids as well, but I don't recall what your estimated power is? has it ever been chassis dyno'd or any track times? I don't plan to use mine as a track car, with the exception of the occasional midnight drags we have here or a test-n-tune for fun, but it gives me a relative reference to base things from in addition to my current 500hp 383 truck.
I know this is an older thread but has anyone done a single turbo setup using the stock manifolds? I was thinking I could run a single exhaust pipe to the front between the lower a arms.Im running a powerdyne supercharger right now but im getting tired of belt slippage think I may have tightened it too much and warped the impeller shaft. Turbo time!! Any thoughts?
I have not heard of a single setup with manifolds but it is for sure a good option... Have a look on the turbo forums and start a thread on there... Get busy and get something together, boost is a wonderful thing!
Im going to be doing a single S475 or 480 setup this winter, I got the mockup up engine put together the other day. It will be forward and up facing headers with the turbo front and center, but if using manifolds are desired I would run the manifolds in stock location , bout the only option anyway then use some 2 1/4 to run back under the xmember next to the lower A arm bolt they will fit perfect there then if you plan having a low rpm quick.boost setup id use a 76 T4 with a .98 or larger AR or two small 44's . Or like you mentioned a cross over then one pipe to the front but it will kinda need to be a 3in and.would possibly get a little tight under the xmember, plus two pipes with a nice merge will help flow, dont worry a bout the tight 90's that will be needed to get the pipes headed back up front ive seen some terrible looking hotsides make plenty o.power
I have looked pretty closely at manifolds to a single My take was merging the pipes in front of the cradle would be easiest to fit, like hugger said. Also I firmly agree with the .98ish a/r. I tried a 1.05 and It didn't spool til 3krpm, too late for my taste. The biggest pain geometrically is getting anything larger than 2.5" back past the engine under the firewall on the exhaust side. For that reason alone I would choose two small turbo and custom manifolds - log style.
What do you think about a single 2x4 tubing routed under he engine cradle ? Just throwing out crazy ideas.
I had considered rectangular tube as well. NASCAR style flat exhaust. Or belonging the round pipes. No matter what you put under the cradle it is hard to keep good ground clearance. You're going to want Togo below the a arm bolts like was mentioned. Totally possible to do it, just depends on how comfortable you are with what ground clearance you'll lose. Take a piece of round 2" and hold it under there to see.
If the car isn't lowered you have gobs of room , if you can do some welding and cutting id notch the cradle a little and possibly then do a bolt slam plate under the pipes to protect them or even get some oval tubing wheres there's a will there's a way
Check with Jason. Bigger car and a 455 but the principle will be about the same because he's using manifolds. He said he has a build of the car on here somewhere. http://www.v8buick.com/showthread.php?298666-Racing-at-Qualcomm
That is exactly what im thinking of. That with a smaller turbo. I think I can weld up something similar ( not as pretty). Can I use a turbo from something like a f250? Im looking for less than 10lbs of boost.I have seen some used turbos on ebay for a couple hundred bucks.
Joint this forum and they can help you pick a good turbo for your application... In many cases we found the twins actually fit easier: http://www.theturboforums.com/forums/236-Newbie-and-Basic-Turbo-Tech-Forum
Has anybody ever tried reversing the exhaust manifolds and placed them on opposite sides? The heads are symmetrical so it may work. That would solve half your problem because the exhaust would already be at the front of the engine. I think the passenger manifold on the driver side should clear the steering on the driver side because it comes out past the end of the manifold. I'm not sure about the original driver side manifold relocated to the passenger side because the outlet comes out under the last exhaust port and may land in the steering or x-member. Just something to ponder.
